I think he is kind of right when he says that a new singer need to get an identity of their own, and stick with what they know best. India has too many copycats of Rafi sahib, Kishore ji and so on. They are sitting in their own homes right now and stuck to their jobs, or singing at a restaurant, bar, or what ever.
If they need to succeed, they need to get better at what they know best.
But still I think that it was wrong of him to ask Mauli to perform once again. I think that the judge were influenced by her second perfomance. First one wasn't that good.